I'm running Windows 7. Yesterday, when I opened a website with Firefox, I saw 3 ads at the top of the site.
Then, when I checked other websites with different browsers, I saw these ads:
In the page source, I can't see any code for these ads. After using Inspect Element, this code was added to the header:
And the code in the body for this ad is:
<a href="http://track.impreskin.pl/product/ImpreSkin/?uid=21002&pid=153&bid=1659" rel="nofollow" title="wygladzanie zmarszczek"><img src="http://track.impreskin.pl/banner/?uid=21002&pid=153&bid=1659" alt="wygladzanie zmarszczek"></a>
I don't see any new and unwanted plugins in my browsers, and I haven't installed Hotspot Shield.
Is this malware, and if so, how can I remove it?